re PR target/13721 (SEGV on inline-asm)

	PR target/13721
	* config/h8300/h8300.c (byte_reg): Call abort() if asked to
	print a operand other than a register.

From-SVN: r77539

gcc/ChangeLog

+2004-02-09  Kazu Hirata  <kazu@cs.umass.edu>
+
+	PR target/13721
+	* config/h8300/h8300.c (byte_reg): Call abort() if asked to
+	print a operand other than a register.
+
 2004-02-09  Roger Sayle  <roger@eyesopen.com>
 
 	* fold-const.c (fold) <NOP_EXPR>: Use the original type conversion

gcc/config/h8300/h8300.c

@@ -338,6 +338,9 @@ byte_reg (rtx x, int b)
     "r4l", "r4h", "r5l", "r5h", "r6l", "r6h", "r7l", "r7h"
   };
 
+  if (!REG_P (x))
+    abort ();
+
   return names_small[REGNO (x) * 2 + b];
 }